72878224 has 20 divisors (see below), whose sum is σ = 148633840. Its totient is φ = 34521120.

The previous prime is 72878213. The next prime is 72878227. The reversal of 72878224 is 42287827.

It is a super-2 number, since 2×72878224² = 10622471066788352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72878227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119562 + ... + 120169.

It is an arithmetic number, because the mean of its divisors is an integer number (7431692).

Almost surely, 2^72878224 is an apocalyptic number.

It is an amenable number.

72878224 is an abundant number, since it is smaller than the sum of its proper divisors (75755616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72878224 is a wasteful number, since it uses less digits than its factorization.

72878224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239758 (or 239752 counting only the distinct ones).

The product of its digits is 100352, while the sum is 40.

The square root of 72878224 is about 8536.8743694633. The cubic root of 72878224 is about 417.7013961345.

The spelling of 72878224 in words is "seventy-two million, eight hundred seventy-eight thousand, two hundred twenty-four".